78 SPENCER: GLACIAL BOULDERS IN CALDERDALE. 
Glacial period by a great glacier from the north, which brought down 
trom Craven and the neighbourhood the limestone boulders now 
found in the district. There appears to be no evidence to show that 
the Lancashire glacier with its boulders of granite, etc., ever reached 
the Cliviger Pass. But there is some evidence to show that a small 
portion of the Craven glacier did come over this Pass, bringing with 
it limestone boulders. 
My friend, the late Mr. A. Stansfield, of Todmorden, informed 
me that, with the exception of a local deposit of limestone boulders 
once met with in an excavation 18 feet deep below the surface at 
Cornholm, no drift deposits had ever been met with in the neigh- 
bourhood of Todmorden. Many years ago, while on an excursion 
on Wadsworth Moor, an old friend of mine, a farmer who lived in 
the locality, called my attention to a local deposit of well-glaciated 
limestone boulders which had been exposed in an old occupation 
road leading on to the land. They were found on the edge of the 
moor at an elevation of about 1,150 feet above the sea-level. 
It would, therefore, appear from these three deposits of limestone 
in comparison with the number of granite and other erratics which 
came over the ridge at Walsden. I subsequently found that the 
Geological Surveyors had also come to the conclusion that our 
alderdale boulders had come over the Pennine Chain somewhere 
in the neighbourhood of Walsden. Some time after seeing the 
opinion of the Geological Surveyors on the subject, I paid a visit to 
my friend, Mr. R. Law, F.G.S., then of Walsden, and we both went 
over that district together, when we traced the granitic boulders here 
and there from Walsden to the other side of the hill, near the 
Walsden Pass. I was satisfied that those erratic boulders we had 
seen had come over the hill, and therefore that we had good grounds 
for believing that our Calderdale boulders of granite, etc., had come 
over by the same way. From Walsden we pass down the valley to 
Hebden Bridge,* and thence to Mytholmroyd, where Mr. Thomas 
Ashworth, a local observer from Hebden Bridge, once discovered 
a considerable number of granite boulders. From this place down- 
wards I have found these far-travelled boulders at Luddendenfoot, 
at Sowerby Bridge, and at North Dean, where they were exposed 
during the excavations made in widening the railway viaduct over 
the Calder, and from whence I obtained a large number of 
ere the late Dr. Alexander has recorded the finding of boulders of granite 
and other foreign rocks during the making of the railway. 
Naturalist, 
